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On a summer day in 1618, a farmer in Epsom, England led his cows to a spring. They refused to drink—too bitter. But when he splashed the water on a rash, it...

L-Arginine
In 1998, three scientists walked onstage in Stockholm to celebrate a discovery that sounded like science fiction: a fleeting gas our bodies make—nitric...

L-Glutamine
The same white powder scooped into smoothies by gym-goers is also an FDA-approved prescription that helps people with sickle cell disease avoid hospital...

L-Isoleucine
You swirl a post-workout shake, thinking about muscle recovery, when a quieter story unfolds inside your body: a single amino acid that can nudge blood sugar...

